[Move] unique_ptr with boost vector container (C++98)
I’m using boost::movelib::unique_ptr with a polymorphic container of type boost::container::vector and getting a compiler error that I can’t seem to figure out (see code sample and attached compiler output). Note, this error occurs when compiling without C++11 support w/ x86-64 gcc 4.9.3. When compiling w/ C++11 support (e.g. -std=c++11) the code compiles fine. Any ideas ? Thanks in advance for any help on this. ---------------------------------------------------- #include <boost/move/unique_ptr.hpp> #include <boost/container/vector.hpp> class FooA { public: FooA() {} virtual ~FooA() {} virtual void execute() {} }; class FooB : public FooA { public: FooB() {} virtual void execute() {} }; int main() { typedef boost::movelib::unique_ptr<FooA> FooAPtr; typedef boost::movelib::unique_ptr<FooB> FooBPtr; boost::container::vector<FooAPtr> fooVector; FooBPtr fooBPtr(new FooB); fooVector.push_back(boost::move(fooBPtr)); return 0; }
On 27/05/2017 21:43, Gene Kang via Boost-users wrote:
I’m using boost::movelib::unique_ptr with a polymorphic container of type boost::container::vector and getting a compiler error that I can’t seem to figure out (see code sample and attached compiler output). Note, this error occurs when compiling without C++11 support w/ x86-64 gcc 4.9.3. When compiling w/ C++11 support (e.g. -std=c++11) the code compiles fine. Any ideas ? Thanks in advance for any help on this.
Move emulation in C++98 does not support automatic conversions from derived to base classes. Try converting to FooAPtr first: #include <boost/move/unique_ptr.hpp> #include <boost/container/vector.hpp> class FooA { public: FooA() {} virtual ~FooA() {} virtual void execute() {} }; class FooB : public FooA { public: FooB() {} virtual void execute() {} }; int main() { typedef boost::movelib::unique_ptr<FooA> FooAPtr; typedef boost::movelib::unique_ptr<FooB> FooBPtr; boost::container::vector<FooAPtr> fooVector; FooBPtr fooBPtr(new FooB); FooAPtr fooAPtr(boost::move(fooBPtr)); fooVector.push_back(boost::move(fooAPtr)); return 0; }
Thanks Ion for the clarification and workaround.
On May 28, 2017, at 4:02 PM, Ion Gaztañaga via Boost-users <boost-users@lists.boost.org> wrote:
On 27/05/2017 21:43, Gene Kang via Boost-users wrote:
I’m using boost::movelib::unique_ptr with a polymorphic container of type boost::container::vector and getting a compiler error that I can’t seem to figure out (see code sample and attached compiler output). Note, this error occurs when compiling without C++11 support w/ x86-64 gcc 4.9.3. When compiling w/ C++11 support (e.g. -std=c++11) the code compiles fine. Any ideas ? Thanks in advance for any help on this.
Move emulation in C++98 does not support automatic conversions from derived to base classes.
Try converting to FooAPtr first:
#include <boost/move/unique_ptr.hpp> #include <boost/container/vector.hpp>
class FooA { public: FooA() {}
virtual ~FooA() {}
virtual void execute() {} };
class FooB : public FooA { public: FooB() {}
virtual void execute() {} };
int main() { typedef boost::movelib::unique_ptr<FooA> FooAPtr; typedef boost::movelib::unique_ptr<FooB> FooBPtr;
boost::container::vector<FooAPtr> fooVector;
FooBPtr fooBPtr(new FooB); FooAPtr fooAPtr(boost::move(fooBPtr));
fooVector.push_back(boost::move(fooAPtr));
return 0; }
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Ion Gaztañaga